Symantec Protection Engine for SharePoint (SPSS) 6.0.9 has been updated with an new validation "Handshake" feature. The Symantec Protection Engine (SPE) bundled with this new version requires a valid encryption token from SPSS for scan requests to be accepted. If the token value provided doesn't match or is missing; the scan will fail.

Resolution:

- Install and register the version of Symantec Protection Engine for Cloud bundled with the Symantec Protection Engine for SharePoint 6.0.9 download package.

- Verify the computer time between the SPSS server and remore SPE servers are as close to identical as possible. A large time mismatch will cause the certificate validation to fail.

- Check for any network timeouts or packet shaping that would modify the ICAP request sent from SPSS to SPE.